Bosch Dishwasher E04 Error: Flow Sensor Failure
What Does Bosch Dishwasher Error Code E04 Mean? Error code E04 on a Bosch dishwasher means the flow sensor has malfunctioned. This sensor measures how much water enters the tub during fill cycles. When it fails, the control board cannot regulate water levels accurately, causing the cycle to abort. Common Causes The flow sensor is […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. The dishwasher may overfill or underfill without a working flow sensor. Do not continue using until repaired.
Can I reset the code?
Yes. A power reset may temporarily clear the error, but if the flow sensor is faulty, E04 will return.
When to stop immediately?
Stop if you notice: Error appears on every cycle, Water levels are visibly inconsistent.
Symptoms You May Notice
Cycle stops mid-wash unexpectedly
The dishwasher halts during a wash program, leaving dishes sitting in dirty water.
Inconsistent water levels in the tub
Sometimes the tub has too much water, other times too little.
Error appears intermittently
E04 may appear on some cycles but not others, suggesting a failing sensor.
Possible Causes
Defective flow sensor
The turbine-style flow sensor that measures water intake has failed or is sending erratic signals.
Requires ProfessionalDebris in the flow sensor
Small particles have lodged in the flow sensor, preventing accurate measurement.
Requires ProfessionalWiring issue to flow sensor
Loose or corroded connections between the flow sensor and control board.
Requires ProfessionalSafe Checks You Can Do
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1
Reset the dishwasher
Turn off the circuit breaker for 60 seconds, then restore power and run a test cycle.
An intermittent E04 may clear after a reset if caused by a temporary glitch.
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2
Clean all filters
Remove and clean the bottom drain filter and fine mesh filter. Debris can migrate to the flow sensor.
Rinse filters under running water and use a soft brush to remove buildup.
When to Call a Professional
Contact a qualified technician if:
- Error persists after power reset and filter cleaning
- Water levels are erratic between cycles
- Flow sensor shows physical damage or corrosion
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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